1312118289 has 6 divisors (see below), whose sum is σ = 1895281986. Its totient is φ = 874745520.

The previous prime is 1312118281. The next prime is 1312118299. The reversal of 1312118289 is 9828112131.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1266149889 + 45968400 = 35583^2 + 6780^2 .

It is not a de Polignac number, because 1312118289 - 2³ = 1312118281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1312118281) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 72895452 + ... + 72895469.

It is an arithmetic number, because the mean of its divisors is an integer number (315880331).

Almost surely, 2^1312118289 is an apocalyptic number.

It is an amenable number.

1312118289 is a deficient number, since it is larger than the sum of its proper divisors (583163697).

1312118289 is a wasteful number, since it uses less digits than its factorization.

1312118289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145790927 (or 145790924 counting only the distinct ones).

The product of its digits is 6912, while the sum is 36.

The square root of 1312118289 is about 36223.1733700956. The cubic root of 1312118289 is about 1094.7736343233.

The spelling of 1312118289 in words is "one billion, three hundred twelve million, one hundred eighteen thousand, two hundred eighty-nine".